add docs and a few little pep8 tweaks

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+.. _Git Data service:
+
+Git Data services
+=================
+
+**Example**::
+
+  from pygithub3 import Github
+
+  gh = Github(user='someone', repo='some_repo')
+
+  a_blob = gh.git_data.blobs.get('a long sha')
+
+  dev_branch = gh.git_data.references.get('heads/add_a_thing')
+
+
+GitData
+-------
+
+.. autoclass:: pygithub3.services.git_data.GitData
+    :members:
+
+    .. attribute:: blobs
+
+        :ref:`Blobs service`
+
+    .. attribute:: commits
+
+        :ref:`Commits service`
+
+    .. attribute:: references
+
+        :ref:`References service`
+
+    .. attribute:: tags
+
+        :ref:`Tags service`
+
+    .. attribute:: trees
+
+        :ref:`Trees service`
+
+
+.. _Blobs service:
+
+Blobs
+-----
+
+.. autoclass:: pygithub3.services.git_data.Blobs
+    :members:
+
+
+.. _Commits service:
+
+Commits
+-------
+
+.. autoclass:: pygithub3.services.git_data.Commits
+    :members:
+
+
+.. _References service:
+
+References
+----------
+
+.. autoclass:: pygithub3.services.git_data.References
+    :members:
+
+
+.. _Tags service:
+
+Tags
+----
+
+.. autoclass:: pygithub3.services.git_data.Tags
+    :members:
+
+
+.. _Trees service:
+
+Trees
+-----
+
+.. autoclass:: pygithub3.services.git_data.Trees
+    :members: